[jumbo] Fix chrome extensions namespace aliases

Several chrome extensions namespace aliases are declared both in
namespace extensions:: and extensions::(anonymous). This is not failing
in non-jumbo build as on each unit it is declared one time. But on jumbo
build same compilation unit includes both aliases, breaking compilation.

Bug: 746956
Change-Id: Ic2255b204a832e7079bda24afb7e8769658dc2e4
Reviewed-on: https://chromium-review.googlesource.com/1105052Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: José Dapena Paz <jose.dapena@lge.com>
Cr-Commit-Position: refs/heads/master@{#568503}

chrome/browser/extensions/api/sessions/sessions_api.cc

@@ -44,13 +44,14 @@
 
 namespace extensions {
 
+namespace tabs = api::tabs;
+namespace windows = api::windows;
+
 namespace {
 
 namespace GetRecentlyClosed = api::sessions::GetRecentlyClosed;
 namespace GetDevices = api::sessions::GetDevices;
 namespace Restore = api::sessions::Restore;
-namespace tabs = api::tabs;
-namespace windows = api::windows;
 
 const char kNoRecentlyClosedSessionsError[] =
     "There are no recently closed sessions.";

chrome/browser/extensions/api/tabs/tabs_event_router.cc

@@ -35,10 +35,10 @@ using zoom::ZoomController;
 
 namespace extensions {
 
-namespace {
-
 namespace tabs = api::tabs;
 
+namespace {
+
 bool WillDispatchTabUpdatedEvent(
     WebContents* contents,
     const std::set<std::string> changed_property_names,